import turtle  # 引用turtle 库

turtle.pensize(2)  # 设置画笔宽度为2像素
turtle.circle(10)  # 绘制半径为10像素的圆
turtle.circle(40)  # 绘制半径为40像素的圆
turtle.circle(80)  # 绘制半径为80像素的圆
turtle.circle(160)  # 绘制半径为160像素的圆
